Screw-cutting die-head



(No Model.)

J. A. BEGHER.

SCREW CUTTING DIE HEAD. No. 389,433. Patented Sept. 11, 1888.

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JAMES A. BEOHER, OF MISHAWAKA, INDIANA.

SCREW=CUTTING DIE HEAD.

SPECIFICATION forming part of Letters Patent No. 9, dated September 111888.

(No model.)

To all whom it may concern.-

Be it known that 1, James A. BEoHER, of Mishawaka, in the county of St.Joseph and State of Indiana, have invented certain new and usefulImprovements in Screw-Threading Machines; and I do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form part of this specification, in which Figure 1is aface view oflhe die-stock closed. Fig. 2 is a similar view of thesame open, the cutter-blocks being removed. Fig. 3 is a side view. Fig.4 is a cross section of the same on line 00 00, Fig. 1. Fig. 5 is across sectional view on line y y, Fig. 1.

This invention is an improved die-stock for cutting screw-threads onbolts; and its objects are to provide a stock with removablecutterbearing blocks having adjustable cutters, and to mount theseblocks so that they can be thrown into working position or opened topermit the immediate withdrawal of the bolt or rod after it is threaded.

Referring to the drawings by letter, A A is a base-plate or disk havinga central opening, a, and which is to be secured on the hollow stub of abolt-threading machine.

B Bare similar opposite semicircular plates pivoted on disk A by boltsI) I), as shown.

Gis a key-spring lying between the pivoted ends of plates B, andretained bya stud, c, on disk A, as shown. This spring acts to separatethe plates.

D D are similar semicircular recesses in the adjoining edges of platesB, coinciding with opening a of the disk when the plates are closed; andd d are smaller recesses in the plates, which engage with a headed stud,1* projecting from thedisk A, and'true the plates, while the head of thestud will keep the plates in close contact with the disk when closed.

F F are grooves on the outer surfaces of plates B, extending fromrecesses D at right angles to the meeting-line of said plates, and ffare screw-threaded studs rising from said grooves, and hereinafterreferred to.

G g are eye-lugs secured to plates B at the free ends thereof andprojecting laterallytherefrom. The eye of lug G is at right angles to wr t I the eye oflug g, as shown, and to this lug is pivoted thebifurcated head of a handle or lever, H.

h hare link-bars pivotally connected to lever H, and to the ends of aT-coupling, I, the screw-threaded stem of which is passed through theeye of lug g and provided with adjusting and securing nuts, as shown.The length of bars in is such that when lever H is thrown outward, asshown in Fig. 1, the plates B will be forcibly closed, and when throwninward, as in Fig. 2, the plates are separated. tdesignates anadjustable stop secured to lug G in position to properly limit the throwof lever H when the die is closed.

J J are similar cutter-bearing blocks corresponding in contour butsmaller than plates B, and are kept in position thereon by flanges j ontheir under sides, which engage in grooves F of the plates and by thestuds ff, which project through proper openings in blocks J and areengaged by proper nuts,which firmly lock the blocks on the plates. Eachblock J has two or more deep slots, K, formed on lines radiating fromthe opening (I. when the die is closed.

It 7c are the cutters placed in slots K and retained therein laterallyby theprojecting heads of screws L, secured in the faces of blocks J, asshown.

2 are adjusting screws engaged in threaded recesses in the walls ofslots K, exterior to the cutters, and by which the latter can be ad justcd, as is evident.

The operation is evident from the foregoing, and it will be observedthat after a bolt or rod has been threaded the cutters can be thrownapart and the bolt removed without necessitating backing thereof. Byremovingblocks J and substituting other blocks having sets of,

different-pitch thread'cutters, the one diestock can be employed incutting many different threads, and the cutters being adjust able in theblocks the same pitch of thread may be cut on varying sizes of rods,(to.

Having described my invention, I claim- 1. The combination of thebase-disk and the plates pivoted thereon, with the radially-slottedcutter-blocks mounted on said plates, substantially as described, andhaving adjustable cutters mounted in said slots, and the lever and linkconnections for throwing said cutterblocks into or out of workingposition, substantially as and for the purpose described.

2. The combination of the base-disk and the plates pivotally mountedthereon, with the removable cutter-bearing blocks mounted on saidplates, having adjustable cutters,and devices, substantially asdescribed, for shifting said plates to throw the cutters into or out ofworking position, substantially as specified.

3. The combination of the base-disk, the pivoted spring-controlledplates thereon, and the blocks carrying adjustable cutters mounted,substantially as described, on said plates, with the eye-lugs projectinglaterally from said plates, the lever pivoted to one lug, the adjustablecoupling connected to the other lug, and the link-bars between saidlever and coupling, all constructed and arranged to operatesubstantially in the manner and for the purpose described.

4. The combination, with the base-disk, the spring-controlled platespivoted thereon, having grooves ,and threaded studs, with the flangedcutterbearing blocks secured on said plate, having radial slots, theadjustable cutters in said slots, the retaining and adjusting screws forsaid cutters, and the shifting devices for said plates, all constructedand'arranged to operate substantially in the manner and for the purposedescribed.

5. The combination of the base-disk having a central opening, thesemicircular plates pivoted thereon, the spring controlling said plates,and the headed studs for truing the same,with the removablecutter-bearing blocks secured on said plates, the adjustable cutters insaid blocks, and the eye-lugs, lever, coupling, and connecting-links forthrowing the plates into or out of position, and the stop for saidlever, all constructed and arranged to operate substantially in themanner as and for the purpose described. In testimony that I claim theforegoing as my own I affix mysignature in presence of two witnesses.

JAMES A. BEGHER. Witnesses:

JAMES DUSHANE, J EANIE ANDERSON.

